adj. 有效的；有法律效力的；正当的；健全的
用作定语
～+ n.
Do you have valid reasons for your absence?
你的缺席有正当理由吗?
He has a valid passport.
他有有效护照。
This is a valid will.
这是一份具有法律效力的遗嘱。
用作表语
S+be+～
His excuse was not valid.
他的借口站不住脚。
Is this contract valid?
这份合同有法律效力吗?
S+be+～+ prep .-phrase
This railway ticket is valid for three days.
这张火车票的有效期是三天。
1. For foreign holidays you will need a valid passport.
出国度假需持有效护照。
2. He recognized the valid points that both sides were making.
他认可双方观点中的合理之处。
3. All tickets are valid for two months.
所有的票在两个月内有效。
4. He did not accept this reply as valid.
他认为这个回答没有根据。
5. a bus pass valid for 1 month
公共汽车月票
6. Illness is a valid excuse for being absent from work.
生病是不去上班的正当理由.